📄 vc++_net中定义和使用mfc dll _2.htm
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<DT>VC++.NET中定义和使用MFC DLL
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作者:sundy26 2005-12-10 来源:论坛 浏览:<SPAN id=count></SPAN> </DIV>
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<DD class=ArticleInfo_3><A
href="http://www.qqread.com/vcdotnet/i662158000.html">上一页</A> <A
href="http://www.qqread.com/vcdotnet/i662158000.html">1</A> <FONT
color=#ff0000>2</FONT>
<DD class=ArticleContent><BR> 在<A
href="http://www.qqread.com/keywords/vcdotnet.html"
target=_blank>VC.Net</A>中使用DLL文件<BR><BR> 新建一个基于对话框的VC.Net工程DemoTestDLL，界面如下图（运行结果图）：<BR>
<P><A href="VC++_NET中定义和使用MFC DLL _2.files/20051210dw203_3.jpg"
target=_blank><IMG alt="VC++.NET中定义和使用MFC DLL"
src="VC++_NET中定义和使用MFC DLL _2.files/20051210dw203_3.jpg"
border=0></A><BR><BR> 为了让DemoTestDLL能够调用TestDLL.dll程序，需要让前者能够"看见"
DLL程序。我们将TestDLL.dll文件考到DemoTestDLL的Debug目录下，一个<A
href="http://www.qqread.com/keywords/windows.html"
target=_blank>Windows</A>程序定位DLL的次序是：<BR><BR> 1、 包含EXE文件的目录。<BR><BR> 2、
进程的当前工作目录。<BR><BR> 3、 Windows系统目录。<BR><BR> 4、 Windows目录。<BR><BR> 5、
列在Path环境变量中的一系列目录。<BR><BR> 在测试DLL按钮添加下面代码：
<TABLE width="90%" border=0>
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<TR>
<TD>void CDemoTestDLLDlg::OnBnClickedButton1()<BR>{<BR>// TODO:
在此添加控件通知处理程序代码<BR>//声明DLL函数<BR>typedef void (_cdecl *GETHOSTNAME)(LPTSTR
strHostName);<BR>typedef void (_cdecl *GETSYSTEMTYPE)(char *
strSystemType);<BR>typedef void (_cdecl *GETIPADDRESSLIST)(char **
lpIPList,DWORD *lpNumber);<BR><BR>//声明函数句柄<BR>HMODULE hTestDLL =
NULL;<BR>GETHOSTNAME GetHostName = NULL;<BR>GETSYSTEMTYPE GetSystemType
= NULL;<BR>GETIPADDRESSLIST GetIpAddressList = NULL;<BR><BR>//
加载动态链接库<BR>hTestDLL = LoadLibrary("TestDLL.dll");<BR>if(hTestDLL ==
NULL)\<BR>{<BR>printf("cannot load
LCDDLL.dll\n");<BR>exit(0);<BR>}<BR><BR>/*** 找到每个函数的入口
****/<BR>//系统名称<BR>GetHostName =
(GETHOSTNAME)GetProcAddress(hTestDLL,"GetHostName");<BR>if(GetHostName==NULL)<BR>{<BR>printf("cannot
load process
GetHostName\n");<BR>FreeLibrary(hTestDLL);<BR>exit(1);<BR>}<BR><BR>//操作系统类型<BR>GetSystemType
=
(GETSYSTEMTYPE)GetProcAddress(hTestDLL,"GetSystemType");<BR>if(GetSystemType==NULL)<BR>{<BR>printf("cannot
load process
GetSystemType\n");<BR>FreeLibrary(hTestDLL);<BR>exit(1);<BR>}<BR><BR>//IP地址列表<BR>GetIpAddressList
=
(GETIPADDRESSLIST)GetProcAddress(hTestDLL,"GetIPAddressList");<BR>if(GetSystemType==NULL)<BR>{<BR>printf("cannot
load process
GetIpAddressList\n");<BR>FreeLibrary(hTestDLL);<BR>exit(1);<BR>}<BR><BR>/***
使用LPTSTR和使用char*定义的效果是一样的 ***/<BR><BR>//取机器名称<BR>LPTSTR szHostName = new
char[1024];<BR>(*GetHostName)(szHostName);<BR><BR>//取操作系统类型<BR>char*
szSystemType = new
char[1024];<BR>(*GetSystemType)(szSystemType);<BR><BR>//IP Address
List<BR>DWORD ipListNumber = 0;<BR>//声明方式一<BR>//LPTSTR* lpAddress = new
LPTSTR[256];<BR>//声明方式二<BR>char** lpAddress = new char*[256];<BR>for(int
i=0;i<256;i++)<BR>{<BR>lpAddress[i] =
NULL;<BR>}<BR>(*GetIpAddressList)(lpAddress,&ipListNumber);<BR><BR>//显示在界面<BR>m_setHostName.SetWindowText(szHostName);<BR>m_setSystemType.SetWindowText(szSystemType);<BR><BR>//将IP添加到list
中<BR>for(int
i=0;i<ipListNumber;i++)<BR>{<BR>m_IPList.AddString(lpAddress[i]);<BR>}<BR>}</TD></TR></TBODY></TABLE> 编译运行的结果如上图所示。<BR><BR></P>
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